Nevada Test Site Calibration Range and Geometric Calibration of Digital Cameras ISPRS I2 Bob Kletzli

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Nevada Test Site Calibration Range and Geometric
Calibration of Digital CamerasISPRS I/2Bob
KletzliSpectrum Mapping, LLCDecember 2-4, 2003
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Outline

• Engineer Sensor For Geometric Stability
• Lock Lenses at Infinity Before Calibration
• Lab Radiometric Calibration
• Terrestrial Geometric Calibration
• In Situ Calibration
• Calibration Verification NTS

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Geometric Stability

• CDD Fixed To Milled Optical Bench
• Lens Receptacle Is Opposite Side
• Each Lens Fixed To Aluminum Socket
• Lenses Are Interchangeable
• Alignment Pins Eliminate Rotation
• TEC Surrounds CCD
• Shake and Bake

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Lens Focus

• Lens Focused At Infinity
• High Frequency Target At 100m
• Each Lens Adjusted Pinned

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Radiometric Calibration

• Lab Tools Include
• Integrating Sphere
• Spectralon Panels
• Spectral Line Lamps
• Lab Processes
• Dark Current
• Flat Fielding
• White Balance

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Terrestrial Range
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Terrestrial Camera Stations
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Bundle Result 1
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Bundle Result 2
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Bundle Result 3
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Bundle Summary
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Insitu Range (NM)

• 400 points by RTK
• 2-3 cm accuracy
• Photo Identifiable
• Variable terrain
• Used for both laser photography
• Building corners surveyed

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Insitu Range Closeup
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NTS Calibration Range
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NTS LandSat
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NTS Site
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Flight Plan
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GPS Trajectory NLV to NTS
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GPS Fwd/Rev RMS (NLV)
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GPS Fwd/Rev RMS (NTS)
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112,000 Images/Control
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112,000 Flight
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118,000 Images/Control
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118,000 Flight
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124,000 Images/Control
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124,000 Flight
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Summary

• Digital Cameras Can be Calibrated to
  Conventional Specifications
• Calibrations Are Maintained Over Time
• Regional Test Ranges Are Extremely Useful For
  Calibration and Verification